perf sched: Add max delay time snapshot

When we have a maximum latency reported for a task, we need a
convenient way to find the matching location to the raw traces
or to perf sched map that shows where the task has been
eventually scheduled in. This gives a pointer to retrieve the
events that occured during this max latency.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260391208-6808-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 6 deletions

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index b12b23ac06f3..7cca7c15b40a 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -140,6 +140,7 @@ struct work_atoms {
         struct thread           *thread;
         struct rb_node          node;
         u64                     max_lat;
+        u64                     max_lat_at;
         u64                     total_lat;
         u64                     nb_atoms;
         u64                     total_runtime;
@@ -1013,8 +1014,10 @@ add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
 
         delta = atom->sched_in_time - atom->wake_up_time;
         atoms->total_lat += delta;
-        if (delta > atoms->max_lat)
+        if (delta > atoms->max_lat) {
                 atoms->max_lat = delta;
+                atoms->max_lat_at = timestamp;
+        }
         atoms->nb_atoms++;
 }
 
@@ -1210,10 +1213,11 @@ static void output_lat_thread(struct work_atoms *work_list)
 
         avg = work_list->total_lat / work_list->nb_atoms;
 
-        printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms |\n",
+        printf("|%11.3f ms |%9llu | avg:%9.3f ms | max:%9.3f ms | max at: %9.6f s\n",
               (double)work_list->total_runtime / 1e6,
                  work_list->nb_atoms, (double)avg / 1e6,
-                 (double)work_list->max_lat / 1e6);
+                 (double)work_list->max_lat / 1e6,
+                 (double)work_list->max_lat_at / 1e9);
 }
 
 static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
@@ -1704,9 +1708,9 @@ static void __cmd_lat(void)
         read_events();
         sort_lat();
 
-        printf("\n -----------------------------------------------------------------------------------------\n");
-        printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms |\n");
-        printf(" -----------------------------------------------------------------------------------------\n");
+        printf("\n ---------------------------------------------------------------------------------------------------------------\n");
+        printf("  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at     |\n");
+        printf(" ---------------------------------------------------------------------------------------------------------------\n");
 
         next = rb_first(&sorted_atom_root);